Fix copy-pasto: A printer is a printer, not an "interface".

new sentence, new line;

Document ulpt(4) firmware support for HP LaserJet printers.

make -column lists pretty again;

specifically, rewrite them to permit some markup in the column headers,
and use "Ta" instead of literal tabs; mandoc does not currently match groff
100%, but a mandoc fix may be some time off, and we've gone enough releases
with poorly formatting column lists.

in some cases i have rewritten the lists as -tag, where -column made
little sense.

The .It macro is parsed, and .Do is callable, so we must escape.
Found by and unbreaking the build with mandoc(1).
OK jmc@

First pass at removing clauses 3 and 4 from NetBSD licenses.

Not sure what's more surprising: how long it took for NetBSD to
catch up to the rest of the BSDs (including UCB), or the amount of
code that NetBSD has claimed for itself without attributing to the
actual authors.

OK deraadt@

convert to new .Dd format;

kill default locators

remove .Pp's before lists and displays;

Sy Pa -> Em
from wiz@netbsd

Second part of the man4 mi cleanup.
- more/better xrefs
- sync .Cd lines with actual configuration files
- intro(4) reference police
- huge usb(4) update
- follow mdoc.samples suggested man page section ordering when necessary
- add netintro(4) and hostname.if(5) xrefs to all ethernet drivers

ok deraadt@ mickey@

o) We don't like .Pp before/after .Sh;
o) .Nm always has argument in .Sh SYNOPSIS;
o) We always closes .Bl and .Bd tags;

millert@ ok

Update USB man pages.